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Long-Term Debt - Narrative (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |
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Apr. 17, 2023 USD ($) | Aug. 31, 2022 USD ($) renewalPeriod | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 | Sep. 30, 2024 renewalPeriod | Sep. 30, 2024 Rate | Sep. 30, 2024 extensionTerm | Dec. 31, 2023 USD ($) | Feb. 16, 2023 USD ($) | Aug. 12, 2022 USD ($) | Jun. 05, 2019 USD ($) tranche
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  |  | $ 0 | $ 651,713,000 |  |  |  |  |  |  |  |
Debt instrument, repurchase program, maximum amount |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000,000 |  |
Threshold percentage |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  |  |
Cash sweeping event | Rate |  |  |  |  |  |  |  |  |  | 175.00% |  |  |  |  |
Rapid amortization event | Rate |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |
Manager termination event | Rate |  |  |  |  |  |  |  |  |  | 120.00% |  |  |  |  |
Interest-only debt service coverage ratio, default event | Rate |  |  |  |  |  |  |  |  |  | 110.00% |  |  |  |  |
Debt service coverage ratio |  |  |  |  |  |  |  | 3.5 |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  | $ 0 | $ 0 |  | 0 | (10,000) |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | 8,000,000.0 |  |  | 8,000,000.0 |  |  |  |  |  | $ 9,500,000 |  |  |
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II and Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of tranches issued | tranche |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2
Series 2019-1 4.194% Fixed Rate Senior Secured Notes, Class A-2-I |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.194%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700,000,000
Repayments of long-term debt | $ 585,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2019-1 4.723% Fixed Rate Senior Secured Notes, Class A-2-II |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  |  |  |  |  |  |  | 4.723% |  |  |  | 4.723% |  |  | 4.723%
Debt instrument, face amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 600,000,000
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) |  |  |  |  |  |  |  | 7.82% |  |  |  | 7.95% |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 325,000,000 |  |  |  |  |  |  |  |  |  |  |  | $ 325,000,000 |
Number of renewal periods | renewalPeriod |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Renewal period term (in years) |  | 1 year |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate after renewal date (in percent) |  | 5.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, amount outstanding |  |  | 100,000,000 |  |  | 100,000,000 |  |  |  |  |  |  |  |  |
Letters of credit outstanding, amount |  |  | 600,000 |  |  | 600,000 |  |  |  |  |  |  |  |  |
Line of credit facility, current borrowing capacity |  |  | 224,400,000 |  |  | $ 224,400,000 |  |  |  |  |  |  |  |  |
Number of additional extensions |  |  |  |  |  |  |  |  | 2 |  | 2 |  |  |  |
Additional extension (in years) |  |  |  |  |  | 1 year |  |  |  |  |  |  |  |  |
Debt, weighted average interest rate (in percent) |  |  |  |  |  |  |  | 7.93% |  |  |  |  |  |  |
Debt issuance costs, gross |  | $ 6,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | 300,000 | 300,000 |  | $ 900,000 | 900,000 |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  | 3,800,000 |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively | Revolving Credit Facility | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  | 2.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively | Letter of Credit | Secured Overnight Financing Rate (SOFR) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively | Letter of Credit | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  | 0.50% |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively | Letter of Credit | Base Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate (in percent) |  | 2.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Series 2022-1 Variable Funding Senior Secured Notes, Class A-1, variable interest rate of 7.82% and 7.95% at September 30, 2024 and December 31, 2023, respectively | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Line of credit facility, expired amount |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 225,000,000 |
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt interest rate (in percent) | 7.824% |  |  |  |  |  |  | 7.824% |  |  |  | 7.824% |  |  |
Debt instrument, face amount | $ 500,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Quarterly principal payment |  |  |  |  |  | $ 1,250,000 |  |  |  |  |  |  |  |  |
Covenant compliance, leverage ratio, maximum | Rate |  |  |  |  |  |  |  |  |  | 525.00% |  |  |  |  |
Make-whole premium |  |  | 37,800,000 |  |  | 37,800,000 |  |  |  |  |  |  |  |  |
Annual principal payment |  |  | 5,000,000 |  |  | $ 5,000,000 |  |  |  |  |  |  |  |  |
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 | Ten Year United States Treasury Bill Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  |  |  | 9.24% |  |  |  |  |  |  |  |  |
Series 2023-1 7.824% Fixed Rate Senior Secured Notes, Class A-2 | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt issuance costs, gross |  |  | 8,000,000 |  |  | $ 8,000,000 |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | 300,000 | 300,000 |  | 800,000 | 500,000 |  |  |  |  |  |  |  |
Debt issuance costs, net |  |  | 6,500,000 |  |  | $ 6,500,000 |  |  |  |  |  |  |  |  |
2019 Class A-2-I And 2019 Class A-2-II Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayments of long-term debt |  |  |  |  | $ 585,100,000 |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Debt instrument, term (in years) |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Quarterly principal payment |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |
Covenant compliance, leverage ratio, maximum | Rate |  |  |  |  |  |  |  |  |  | 525.00% |  |  |  |  |
Ratio of indebtedness to net capital | Rate |  |  |  |  |  |  |  |  |  | 410.00% |  |  |  |  |
Debt issuance costs, gross |  |  | 12,900,000 |  |  | 12,900,000 |  |  |  |  |  |  |  |  |
Amortization of debt issuance costs |  |  | 200,000 | $ 200,000 |  | 700,000 | 1,300,000 |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt |  |  |  |  | $ (1,700,000) |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance costs |  |  | 1,500,000 |  |  | 1,500,000 |  |  |  |  |  |  |  |  |
Annual principal payment |  |  | $ 6,000,000 |  |  | $ 6,000,000 |  |  |  |  |  |  |  |  |
2019 Class A-2-I And 2019 Class A-2-II Notes | Ten Year United States Treasury Bill Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional interest on fixed rate (in percent) |  |  |  |  |  | 7.64% |  |  |  |  |  |  |  |  |
Class A-2-I Notes | Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain (loss) on extinguishment of debt | $ (1,700,000) |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |
Extinguishment of debt |  |  |  |  |  |  | $ 67,900,000 |  |  |  |  |  |  |  |

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